#!/bin/sh


prefix=gst

while [ "$1" ] ; do
  case $1 in
    --help)
      cat <<-EOF
Usage: element-maker [OPTIONS] ELEMENT_NAME BASE_CLASS
Create a GStreamer element that subclasses BASE_CLASS.
Options:
  --help             Print this information
  --prefix PREFIX    Use PREFIX instead of "gst"
Example: 'element-maker my_element basetransform' will create the files
  gstmyelement.c and gstmyelement.h that implement GstMyElement, a
  subclass of GstBaseTransform, as an element named myelement.
EOF
      exit 0
      ;;
    --prefix)
      shift
      prefix=$1
      ;;
    -*)
      echo Unknown option: $1
      exit 1
      ;;
    *)
      if [ "$name" = "" ]; then
        name=$1
      elif [ "$class" = "" ]; then
        class=$1
      else
        echo Ignored: $1
      fi
  esac
  shift
done

if [ "$name" = "" -o "$class" = "" ] ; then
  echo "Usage: element-maker [OPTIONS] ELEMENT_NAME BASE_CLASS"
  exit 1
fi

if [ ! -f "gst$class.c" ] ; then
  echo "Template file for $class not found."
  exit 1
fi


PREFIX=$(echo $prefix | sed -e 's/\(.*\)/\U\1/')
NAME=$(echo $name | sed -e 's/\(.*\)/\U\1/')
Prefix=$(echo $prefix | sed -e 's/_\(.\)/\U\1/g' -e 's/^\(.\)/\U\1/')
Name=$(echo $name | sed -e 's/_\(.\)/\U\1/g' -e 's/^\(.\)/\U\1/')

GST_IS_REPLACE=${PREFIX}_IS_${NAME}
GST_REPLACE=${PREFIX}_${NAME}
GST_TYPE_REPLACE=${PREFIX}_TYPE_${NAME}
GstReplace=${Prefix}${Name}
gst_replace=${prefix}_${name}
gstreplace=${prefix}$(echo $name | sed -e 's/_//g')
replace=$(echo $name | sed -e 's/_//g')

if [ "$REAL_NAME" = "" ] ; then
  REAL_NAME=FIXME
fi
if [ "$EMAIL_ADDRESS" = "" ] ; then
  EMAIL_ADDRESS=fixme@example.com
fi

source=gst$class.c
pkg=`grep -A 10000 '^% pkg-config' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`
GST_TYPE_BASE_REPLACE=`grep -A 10000 '^% TYPE_CLASS_NAME' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`
GstBaseReplace=`grep -A 10000 '^% ClassName' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`

generate ()
{

cat <<-EOF
/* GStreamer
 * Copyright (C) $(date +%Y) $REAL_NAME <$EMAIL_ADDRESS>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
EOF

cat <<-EOF
/**
 * SECTION:element-$gstreplace
 *
 * The $gstreplace element does FIXME stuff.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch -v fakesrc ! $gstreplace ! FIXME ! fakesink
 * ]|
 * FIXME Describe what the pipeline does.
 * </refsect2>
 */
EOF

#grep -A 10000 '^% copyright' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

EOF

grep -A 10000 '^% includes' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF
#include "gstreplace.h"

/* prototypes */

EOF

grep -A 10000 '^% prototypes' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% prototypes' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% prototypes' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

enum
{
  PROP_0
};

/* pad templates */

static GstStaticPadTemplate gst_replace_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/unknown")
    );

static GstStaticPadTemplate gst_replace_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/unknown")
    );

/* class initialization */

GST_BOILERPLATE (GstReplace, gst_replace, GstBaseReplace,
    GST_TYPE_BASE_REPLACE);

static void
gst_replace_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_replace_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_replace_sink_template));

  gst_element_class_set_details_simple (element_class, "FIXME",
      "Generic", "FIXME", "$REAL_NAME <$EMAIL_ADDRESS>");
}

static void
gst_replace_class_init (GstReplaceClass * klass)
{
EOF
grep -A 10000 '^% declare-class' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% declare-class' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% declare-class' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

echo

grep -A 10000 '^% set-methods' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% set-methods' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% set-methods' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

}

static void
gst_replace_init (GstReplace * replace, GstReplaceClass * replace_class)
{

}
EOF


grep -A 10000 '^% methods' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% methods' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% methods' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1


cat <<EOF

static gboolean
plugin_init (GstPlugin * plugin)
{

  gst_element_register (plugin, "replace", GST_RANK_NONE,
      gst_replace_get_type ());

  return TRUE;
}

#define VERSION "0.0.FIXME"
#define PACKAGE "FIXME_package"
#define PACKAGE_NAME "FIXME_package_name"
#define PACKAGE_ORIGIN "http://FIXME.org/"

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "replace",
    "FIXME",
    plugin_init, VERSION, "LGPL", PACKAGE_NAME, PACKAGE_ORIGIN)

EOF


}

generate_header ()
{

grep -A 10000 '^% copyright' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF
#ifndef _GST_REPLACE_H_
#define _GST_REPLACE_H_

EOF

grep -A 10000 '^% includes' base.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' gobject.c | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' $source | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

G_BEGIN_DECLS

#define GST_TYPE_REPLACE \
  (gst_replace_get_type())
#define GST_REPLACE(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_REPLACE,GstReplace))
#define GST_REPLACE_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_REPLACE,GstReplaceClass))
#define GST_IS_REPLACE(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_REPLACE))
#define GST_IS_REPLACE_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_REPLACE))

typedef struct _GstReplace GstReplace;
typedef struct _GstReplaceClass GstReplaceClass;

struct _GstReplace
{
  GstBaseReplace base_replace;

};

struct _GstReplaceClass
{
  GstBaseReplaceClass base_replace_class;
};

GType gst_replace_get_type (void);

G_END_DECLS

#endif
EOF


}


generate | sed \
  -e "s/GST_BASE_REPLACE/$GST_BASE_REPLACE/g" \
  -e "s/GST_TYPE_BASE_REPLACE/$GST_TYPE_BASE_REPLACE/g" \
  -e "s/GstBaseReplace/$GstBaseReplace/g" \
  -e "s/GST_IS_REPLACE/$GST_IS_REPLACE/g" \
  -e "s/GST_REPLACE/$GST_REPLACE/g" \
  -e "s/GST_TYPE_REPLACE/$GST_TYPE_REPLACE/g" \
  -e "s/GstReplace/$GstReplace/g" \
  -e "s/gst_replace/$gst_replace/g" \
  -e "s/gstreplace/$gstreplace/g" \
  -e "s/replace/$replace/g" >$gstreplace.c

generate_header | sed \
  -e "s/GST_BASE_REPLACE/$GST_BASE_REPLACE/g" \
  -e "s/GST_TYPE_BASE_REPLACE/$GST_TYPE_BASE_REPLACE/g" \
  -e "s/GstBaseReplace/$GstBaseReplace/g" \
  -e "s/GST_IS_REPLACE/$GST_IS_REPLACE/g" \
  -e "s/GST_REPLACE/$GST_REPLACE/g" \
  -e "s/GST_TYPE_REPLACE/$GST_TYPE_REPLACE/g" \
  -e "s/GstReplace/$GstReplace/g" \
  -e "s/gst_replace/$gst_replace/g" \
  -e "s/gstreplace/$gstreplace/g" \
  -e "s/replace/$replace/g" >$gstreplace.h

gst-indent $gstreplace.c

echo pkg is $pkg

gcc -Wall $(pkg-config --cflags gstreamer-0.10 $pkg) -c -o $gstreplace.o $gstreplace.c
gcc -shared -o $gstreplace.so $gstreplace.o $(pkg-config --libs gstreamer-0.10 $pkg)